/* Copyright (c) 2016, Josh Baker <joshbaker77@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Redis nor the names of its contributors may be used
 *     to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED by THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef HASH_H_
#define HASH_H_

#if defined(__cplusplus)
extern "C" {
#endif

/* hashEncode creates a geohash from the provided lat,lon.
 * Make sure that the hash has enough room to fit the precision.
 * The return value is zero for error or the number of
 * bytes written to the hash string. */
int hashEncode(double lat, double lon, int precision, char *hash);

/* hashDecode decodes a geohash and puts the results into lat,lon.
 * The return value is zero for error or one for success.
 */
int hashDecode(char *hash, double *lat, double *lon);


/* hashBounds decodes a geohash into bounds and puts the results 
 * into swlat,swlon,nelat,nelon.
 * The return value is zero for error or one for success.
 */
int hashBounds(char *hash, double *swLat, double *swLon, double *neLat, double *neLon);


#if defined(__cplusplus)
}
#endif

#endif  /* HASH_H_ */
